I take it you want to install a circuit for outlets for standard lamps ect rather than ceiling roses? using 3 pin 5A sockets, if so then fine as a radial with no need to return to C.U.
However if you are creating a new circuit then it is a controlled installation under bldg regs 'Part-P' see 'Projects'
Radials for lighting
Rings for 13 amp power,ie sockets etc, only
2 or 5 amp type sockets only allowed on lighting circuits, fused at 6 or10 amp max at supply fuse.
These sockets usually wired back to each room ceiling rose, usually 1.5 cable as a radial so the existing room switch will work the lights.
Subject to total lamp load and possible part p work.
You can wire them to the fusebox (Radial 1.5 cable),but each light will then need its own switch fitted, so you might as well put twin power sockets in which could be used for other stuff as well.(ring or radial 2.5)
Also possible part p work
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